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I installed VS.2017 Enterprise and start a web performance project. When I try to add a Web performance test to the project I receive the error:

"The Web test could not be loaded: Could not load the type 'Microsoft.VisualStudio.TestTools.WebTesting.SharepointInformation' from assembly 'Microsoft.VisualStudio.QualityTools.WebTestFramework' Version=10.0.0.0, .."

Scott
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Silviu Saulea
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  • At what point, precisely, in the addition of a test is the error reported? Please [edit] the question after reading the [help] pages and doing the [tour]. – AdrianHHH Aug 04 '17 at 14:32

2 Answers2

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TL;DR:

  1. Check installed prerequisites in the latter part of Create a web performance and load test project
  2. In my case, replacing original file C:\windows\assembly\GAC_MSIL\Microsoft.VisualStudio.QualityTools.WebTestFramework\10.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.QualityTools.WebTestFramework.dll with C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\ReferenceAssemblies\v4.0\Microsoft.VisualStudio.QualityTools.WebTestFramework.dll solved the problem.

I tackled the same issue. Every time I created Web Performance and Load Test Project in Visual Studio 2017 Enterprise (with arbitrary .NET framework version) I got the same error when I tried to open *.webtest file. VS's user interface seemed incomplete and clicking on toolbars sometimes shown null exceptions.

At first, I thought I have incomplete installation, according to Create a web performance and load test project. I have even tried to completely uninstall and reinstall mentioned packages. Unfortunately, this did not help. I have also experimented with adding and removing reference to Microsoft.VisualStudio.QualityTools.WebTestFramework as there are several options in my reference browser, but without success.

There is not much information about WebTesting.SharepointInformation namespace. After a while, I discovered the existence of Microsoft.VisualStudio.QualityTools.WebTest.SharePoint.dll and after closer inspection, I have noticed that it references QualityTools.WebTestFramework assembly in C:\Windows\assembly\... that has the same assembly version and public key token, yet smaller in size compared to the one that is contained in VS 2017 installation. I have replaced it with VS2017's one and voila, *.webtest can be successfully opened.

cek-cek
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    This perfectly solved my issue. To bypass administrative access leading to "Access is denied: ‘xxx.dll’" when updating update DLLs, check this post: https://stepbistep.net/2012/06/26/access-is-denied-xxx-dll-manually-add-an-assembly-dll-to-the-gac-on-windows-server-2008-r2/ – evilom Sep 22 '17 at 01:56
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The above answer is correct but the problem is the directory isn't accessible in my case due to some reasons so I just open my cmd and run this command. Just run, it will copy the file, but first turn of the vs.

copy "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\ReferenceAssemblies\v4.0\Microsoft.VisualStudio.QualityTools.WebTestFramework.dll" "C:\windows\assembly\GAC_MSIL\Microsoft.VisualStudio.QualityTools.WebTestFramework\10.0.0.0__b03f5f7f11d50a3a"
teleman
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Younus Paperwala
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